DE2335747A1 - RECORDER SHEET - Google Patents

Description

DR. E. WIEGAND D iPHNG. W, Nl EM AN N DR. M. KOHLER DIfL-ING. C. GERNHARDT

MÖNCHEN HAAABURG TELEPHONE, 555476 8O ₀₀ MONKS 2, TELEGRAMS; KARPATENT MATH ILDENSTRASSE 12

W 41 715/73 - Ko / DE July 13, 1973

Pu31 Photo Film Co., Ltd. Minaini Ashigars-shi, Eanagawa / Japan

Recording sheet

The invention relates to a recording sheet, In particular, a record sheet in which an improved Color developer is used up.

According to the invention there is provided a recording sheet specified $ which has a shift of a color tviickler, which a color picture after contact with οincm color coupler results, wherein 'the layer at least one metal compound an aromatic carboxylic acid and a surfactant.

There are known recording sheets in which the color reaction of an electron donating colorless organic Compound which forms a distinct color when combined with an acid (hereinafter referred to as color former referred to), such as malachite green lactone, Benzoylleukoffiethylenblau, Kristallviolettlaeton, Rhodamine-B-Lactam, 3-dialkylamino-7-dialkylaminofluoran and 3 - methyl-2,2 ~ spirobi (berizo (f) curnol) comes into contact, with a fen ten sour subij'tanz that in contact with

309885/1109

^s * d ont® _NAL

ν ''] Ί κ '■ ·' Λ '/

/ Γ, ν <1 S / <■ '- f'

a color developing (hereinafter referred to as a color developer) is applied to the color former.

As recording sheets in which the above appearance is applied in practice, the result is pressure adjustment Sensitive copy paper (see e.g. IB-PS 2 505 470, 2 505 489, 2 550 471, 2 548 366, 2 712 507, 2 730 456, 2 730 457 and 3 418 250) and heat therapy Copy papers (see, for example, Japanese Paterite Publication 4160/68 and U.S. Patent 2,939,009). Furthermore, a printing method is known in which a printing ink containing Color coupler on a sheet coated with a color developer through a medium such as a stencil is applied to obtain a colored image (cf. DOS 1 939 962).

In many cases the color reaction requires rait aera Color coupler print from a pen or typewriter, Heat or other physical modifications to the Initiate a reaction.

Pressure sensitive copier papers are typical examples for such recording sheets. A print sensitive one Copy paper is obtained by using a color coupler in a solvent such as cineia alkylated naphthalene, alkylated diphenyl or alkylicx ten diphenylisethane, the solution is dissolved in a binder is dispersed or encapsulated in microcapsules and then the dispersion or the microcapsules on a support such as paper, plastic filament or resin-coated paper.

A heat-sensitive copier paper is obtained by adding a color coupler together with a heat-fusible one Substance such as Acetani.lid is attached to a carrier. In this case the term means "heat-fusible substance" means a substance that is after

BATH ORIGINAL

709885/11 Oi

Heating melts and dissolves in the color coupler.

On the other hand, a color developer is usually mixed with a binder in water or an organic solvent dissolved or dispersed and drawn onto a support or impregnated therein. The color developer can also be done immediately before the recording Process can be coated or impregnated in this way.

In general, the color coupler and the color developer are each set on the same or opposite one another Surfaces of a carrier or applied to different carriers.

As the above-mentioned color developers, clays such as Japanese acid - clay, activated clay, attapulgite, zeolite and bentonitej organic acids such as succinic acid, Tannic acid, bile acid and phenolic compounds and acidic polymers such as phenolic resins are known.

In particular, the phenolic resins have attracted attention as new color developers (see Japanese Patent Publication 20144/67) and a number of improvements have been proposed (see U.S. Patents 3,516,845 and 3,540,911 and British patent specification 1,065,587).

The phenolic resins do not have enough color developing power and their color images show poor lightfastness although they are excellent in Ywater resistance when reacted with a color coupler are. For example, a color image obtained from a phenol resin and crystal violet lactone is discolored light not only when exposed to light but also when standing in a room, and the surface of the phenolic resin, which did not undergo any reaction (color development) turns yellow.

109885/1105

Other acidic polymers such as maleic rosin, or partially or fully hydrolyzed styrene maleic anhydride copolymers inherently have poor color developing power and practically cannot be used.

The applicant recently proposed that a metal compound of an aromatic carboxylic acid is effective as a color developer for recording sheets That is, the behavior of a color developer can be improved by using a metal compound of an aromatic Carboxylic acid can be significantly improved. However, the color developing power and the film surface strength are a coated layer formed from such a system is not always sufficient (depending on the conditioning of the color developer coating solution), leaving room for improvement.

One object of the invention is somib in one Recording sheet with improved color developing power and film surface strengthening kit.

Another object of the invention is to improve the peelability of coating solutions, those in the production of a recording sheet of improved color developing power and film surface strength be used.

It has been observed that when a coating solution, which is a metal compound of an aromatic carboxylic acid contains, was produced, not only the viscosity of the coating solution is increased, but also a metal compound in the form of particles, so that the color developing power and the film surface strength of the finished color developer layer were often insufficient and that the above objects of the invention were achieved by incorporating a surfactant into a color developer coating solution, containing a metal compound of an aromatic carboxylic acid.

309885/1109 BAD ORtälNAL

While the metal compound of an aromatic carboxylic acid can be used alone as a color developing component since it has itself ear developing power owns, it can also develop together with other color developers be used.

The coating solution containing a metal compound of an aromatic carboxylic acid can be prepared by adding at least one metal compound of an aromatic Carboxylic acid is dissolved or dispersed in a solvent. Among those which can be used according to the invention Solvents include water, an organic solvent and other liquid media for an aromatic carboxylic acid, a metal salt and a metal compound an aromatic carboxylic acid. However, the most preferred is the solvent to be used in the invention Water. If a surfactant is not added, the viscosity of the manufactured products will increase Coating solution in the course of manufacture on and occasionally it cannot be raised. The addition of a surfactant during or after manufacture however, the coating solution does not lead to an increase the viscosity. The surfactant becomes useful during the manufacture of the metal compound added to an aromatic carboxylic acid, v / eil the preparation of the coating solution without loss of the effect the invention can be simplified.

The surface-active agents which can be used in the invention are anionic surface-active agents such as, for example, Turkish red oil (sulfated castor oil-alkylphenol-ethylene oxide adduct), alkyl sulfoates of the formula ROOCCH ₂ SO ₃ X,
higher alcohol sulfates of the formula ROSO ₅ S, alkylbenzenesulfonates of the formula

30988 5/1109

Alkyl sulfonates of the formula ESO ₅ X,

Soaps of the formula RCOOX,

Dialkyl sulfosuccinates of the formula XO ₃ S-CHCOOR,

CH ₂ COOR

Alkylnaphthalene sulfonates of the formula

higher alcohol phosphates of the formula ROP (OX) ₂ , naphthalenesulfonate-formalin condensates of the formula

(SO ₅ X

Polyoxyethylene alkyl sulfonates of the formula R (OC ₂ H.) OSO ^ X. Dialkyl phosphates of the formula y ^

sulfated olefins of the formula RR ₁ CHS0 ^ sulfated fatty acid ester salts of the formula

the compound of the formula RCONHCh ₂ COOX

CHCOOX

and the compound of the formula CH ₅ (CH ₂ ) ₇ CH = CH (CHg) ₇ CON (CH ₃ JCH ₂ CH ₂ SO ₃ Na ^

ORIGINAL INSPECTED 3 09885/1103

where R and R .. each denote an alkyl radical having 1 to 30 carbon atoms, preferably 8 to 20 carbon atoms, in particular 12 to 18 carbon atoms, and R + R .. have 1 to 30 carbon atoms, preferably 8 to 20 carbon atoms, Rg is a methylene group represent in such a way that the total carbon atoms of R and R _{2 are} 1 to 30, preferably 8 to 20, m is an integer from 2 to 10, preferably 6 to 9, η is an integer from 1 to 6 and X is an alkali metal such as ITa or K or an ammonium group; cationic surfactants such as tertiary amines and ethanolamine ester salts, nonionic surfactants such as glycerol monofatty acid esters and sugar fatty acid esters, and mixtures thereof.

Especially show anionic surfactants eitie large ^T MPACT, and alkylbenzenesulfonic, higher Alkoholschwefelsäureestersalze, naphtha linsuIfonsäuresalz-formaldehyde condensates and Alkarylsulfonsäuresalze are most preferred.

The chemical structures of the above surfactants Funds are generally not open, however are trade products of these means easily accessible. The amount of surfactant added is more than 0.5 part by weight, preferably 1 to 20 parts by weight, per 100 parts of a metal compound of an aromatic Carboxylic acid.

The coating solution prepared as described above 5 to 50 parts by weight of a binder, such as latex, polyvinyl alcohol, maleic anhydride-styrene copolymer, Starch and gum arabic, each containing 100 parts by weight of coating solution (pesticide content). It should be noted that all binders known as film-forming materials according to the invention can be used. The binders can be divided into three groups, i.e. (1) a water-

30 9 885/110 9 _ßA0

soluble or hydrophilic binder, e.g. a natural compound such as "e.g. proteins, e.g. gelatin, Gum arabic, colloidal albumin, casein, celluloses, e.g. carboxymethy Ic ellulos e, hydroxyethyl cellulos e, sucrose, e.g. agar, sodium alginate, starch, carboxymethyl starch and synthetic compounds, such as polyvinyl alcohol, Poly-N-vinylpyrrolidone, polyacrylate, polyacrylamide j (2) a water-dispersible binder, e.g. latex, such as a styrene-butadiene copolymer latex, Styrene maleic anhydride copolymer latex and (3) a binder that is soluble in organic solvents, e.g. nitrocellulose, ethyl cellulose or polyester. These Binders can be used in the form of solutions or dispersions in a solvent according to the invention and the binder can be varied depending on the kind of the solvent. Preferably in water soluble or dispersible binders are used in the aqueous solution or dispersion. Of course you can the metal compound of the aromatic carboxylic acid can be absorbed without using the binder. It should be noted that the binder can be used optionally because it is in cases where the solvent is organic in nature is, may not be necessary.

Acid resins, e.g. Phenol-formaldehyde resins, such as p-phenylphenol-formaldehyde resin, p-tert-butylphenol-formaldehyde resin, p-chlorophenol-formaldehyde resin, other color developers, such as Japanese acid clay and active clay, attapulgite, inorganic pigments such as metal oxides and metal hydroxides or their chemically or physically treated products are added. Examples for the metal are Zn, Mg and Al.

3 0 9 8 8 5/110.

The Japanese acid clay, active clay or attapulgite is generally used in an amount of not less than 1% by weight , preferably 20 to 2000% by weight, more preferably 500 to 1000% by weight, based on the metal compound of the aromatic carboxylic acid. and
the metal oxide or hydroxide is generally used in an amount of about 20 to 400 wt .- $, preferably 50 to 200 wt .- ^, based on the metal compound of their omatic tables carboxylic acid.

The metal compound of an aromatic carboxylic acid is a salt of such an acid, e.g.
Zinc, tin, aluminum, nickel, magnesium or
Calcium salt of an aromatic carboxylic acid, and these salts can be easily obtained by stirring an aromatic carboxylic acid or an alkali salt thereof with a metal hydroxide, sulfate or nitrate in the presence of an alkali. In this process the pH, temperature and pressure are not critical. As described above, the addition of the surface active agent during or after the reaction of the aromatic carboxylic acid or its alkali salt with the metal salt results in stable and efficient preparation of the color developer coating solution.

The aromatic carboxylic acid is preferably represented by the following formulas:

COOH COOH

30983 5/1 1 Q <J

where R can be the same or different and is a hydrogen atom, a hydroxy group, a halogen atom, e.g. Chlorine, a nitro group, an alkyl group with 1 to 10 carbon atoms, preferably 3 to 6 carbon atoms, where the total carbon atoms are less than 13, an ary! group, e.g. a pheny! group, a Arylamino group such as anilino group and an alicyclic group such as hexyl group means, m is an integer from 0 to 7 and η is an integer from 0 to 5., and the aromatic carboxylic acid can be represented by the substituent R as a methylene group be dimerized.

More preferred compounds are those of the formulas

in which R, m and η have the meaning given above. Most preferred compounds are those of the formula

where R has the meaning given above, η is 1 or 2 and R is in the meta position with respect to the hydroxy group is linked.

309885/1109 ORIGINAL INSPECTED

Examples of the aromatic carboxylic acids are benzoic acid, o ~, m- or p ~ chlorobenzic acid, o-, p-nitrobenzoic acid, o-, m- or p-ioluic acid, 4-methyl-3-nitrobenzoic acid, 2 -Chlor-4-nitrobenzoic acid, 2 _f 5 -Bolilobenzoic acid, 2,4-dichlorobenzoic acid, p-isopropybenzoic acid, 2,5-methylbenzoic acid, p-tert-butylbenzoic acid, F-pbenylanthranilic acid _s 4 ~ Ι ^ν Γεΐη3'Ί-3-nitrobenzoic acid, salicylic acid, m-hydroxybenzoic acid ,. p-Eydroxybenzoesäure, 3, 5- IXinltrosalicy! acid, 5-tert-Butylsallcy! acid ', 3-phenyl-salicylic acid, 3-Metbyl-5- tert-butylsa! icyIsäure, 3,5-di-tert-butyl butylsalicylic acid, 3,5-Biamylsa! icy Is aur e ,. 3-Cyc lohexy Isa licy 1-acid, 5-Cycloliexylsalicyläure ,, 3-I'ietny3- ~ 5 ~ 13 oainyl- salicylic acid, 5-Isoamylsa licy! Acid, 3,5-Di-selCc-butylsalicj ^ lic acid, " 5-! TonyIs a! icy is äure, 2 -Hy dr oxy-3 ~ iHc tliy 1- ΐ) ensoeijäure "2 ~ hydroxy-5-tert. -butyIbenzoesäure _t, 2.4 KresotinsäLire, 5,5 '-Methylend is a licy is acid, ο-, πι- or p-acetaminobenzoic acid, 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid, anacardic acid, 1-faphthoic acid, 2-naphthoic acid, 1 ~ piydroxy ™ 2 »naplithoic acid, 2-hydro>: y-3-naphthoic acid, 2-IIydroxy-1 naphthocsäure, thiosalicylic acid _2-r Carboxybensaldchyd and öerglelchen.

Above all, aromatic carboxylic acids are with at least a hydroxyl group particularly effective and such with a hydroxyl group in the ortho position, d.tu the aromatic carboxylic acids of the following formula:

CQOH COOH

309885 / Π OK

where R, m and η have the meaning given above, are more effective.

As metals, which are used according to the invention Form metal compound of aromatic carboxylic acid, the following can be mentioned: metals of group I B of the periodic table, such as copper and Silver ^ Group II A metals, such as magnesium and calcium ^ metals of group II B, e.g. zinc, cadmium and mercury! Group III B metals, e.g. Aluminum and gallium? Group IV A metals, e.g. tin and lead, Group VI A metals, e.g. chromium and Molybdenum? Group VII B metals such as manganese and Group VIII metals such as cobalt and nickel. Under of these metals, zinc, tin, aluminum and nickel are particularly effective.

The resulting coating solution of the color developer ^ is applied to a support such as paper, synthetic paper or synthetic resin film so applied that the amount of the metal compound of an aromatic carboxylic acid is more than 0.1 g / m, preferably

0.5 to 2 g / m 2. The effect of the invention disappears not at an amount outside the range given above, because the amount of the drawn up Solution is determined by economic reasons.

The recording sheet according to the invention is characterized in that it is both a metal compound an aromatic carboxylic acid as well as a surface active agent in the color developer contains and various optional additives in the color developer layer, their amount, the method of addition, the shape and type of the color coupler which couples with the color developers, their shape and the solvents therefor are determined using the techniques available in the recording sheet art.

309885/1 1 OSi

As a color developer coating solution with uniform small particles or in the form of an emulsion in the presence of a surfactant the recording sheet according to the invention shows excellent color developing power and strength the coated layer can be reduced; therefore, a high-density color image is directly formed Contact with a color coupler. The film surface (the surface of the coated layer) is before and after stable in use because of their excellent film surface strength. Furthermore, the viscosity of the Coating solution in the process of making the Recording sheet according to the invention not increased, so that the coatability is improved. Consequently is not just a sizing press coating while running Machine carried out with advantage, but also the slot nozzle covering is done in a simple V / eise. These advantages result in a thin applied layer as well as a reduction in production costs.

The recording sheet of the invention is illustrated in detail by the following examples.

The effect in the examples was achieved through combination a top paper where containing a color coupler (prepared as described below) Mitookapsein were applied to a carrier, with a lower paper in which the color developer according to the invention was mounted on a support.

The microcapsules containing the color coupler can be manufactured by various known methods however they were here according to US Pat. No. 2,800 manufactured as follows. In the following examples, parts mean parts by weight.

309885/1103

10 parts of acid-treated pig skin gelatin and 10 parts of gum arabic were added to 400 parts of water. 40 ^° C., 0.2 part of Turkish red oil was added as an emulsifier and 40 parts of color coupler oil were dispersed for emulsification. The color coupler oil was prepared by dissolving 2 $ crystal violet acetone or 3-benzylamino-7-diethylaminofluoran in diisopropylinaphthalene. If the size of oil drops was 5 microns on average, the emulsification was canceled. After adding water at 40 ^° C. to produce a total of 900 parts, stirring was continued for a period of, for example, 10 minutes, during which it was ensured that the liquid temperature was ^{above 40 ° C.} Then acetic acid was added to adjust the pH of the liquid to 4.0-4.2 and coacervation was induced.

After stirring for another 20 minutes, the system was cooled with ice water to gel the coacervate film deposited around the oil droplets. 7 parts of 37 ^ 5 formalin were added at a Flussigkeitstemperatür of 20 ⁰ C. An aqueous 15% caustic soda solution was added at 10 ^° C. in order to set a pH value of 9.

The system was then heated with stirring for 20 minutes to bring the liquid temperature to 50 ^f! C to bring.

The obtained dispersion of microcapsules was

cooled to 30 ⁰ C and then drawn up so that the on a

2 2

Paper of 40 g / m 2 absorbed solids amount was 5 g / m and dried to form a capsule sheet.

In the following examples, all measures were carried out at room temperature and normal pressure, unless otherwise stated.

309 88 5/1109

BAD ORKaINAL

example 1

60 parts of kaolin and 2 parts of a surfactant mentioned below were dissolved or dispersed in 30 parts of water, and the pH of the dispersion was adjusted to 10 by a 10 ^ aqueous solution of caustic soda. 70 parts of an aqueous 10 % zinc chloride solution was added to the dispersion with slow stirring, and a solution of 0.1 g equivalent of an aromatic carboxylic acid as mentioned below in 200 parts of an aqueous 2% caustic soda solution was added with stirring to cause the reaction admitted. 50 parts of a styrene-butadiene copolymer latex (molar ratio of styrene to butadiene 1: 1; 40 % solids) hereinafter referred to as SBR-Iatex) were added to the dispersion to prepare a coating solution, which was applied by means of a coating stick so that a quantity of solids of 3 g / m 2
and dried.

gg,

ο ο

of 3 g / m applied to a paper of 50 g / m

Matching attempt 1

For comparison, a Parbentw.ickler's sheet was made in the same manner as in Example 1, but without application of the surfactant, obtained »

Example 2

70 parts of Japanese sour clay, 1 part of sodium hexametaphosphate and 4 parts of a surfactant mentioned below were used in 300 parts of Was water is dispersed or dissolved, and the pH has been adjusted to a? aqueous 10 $ caustic soda solution set to 10 » 107 parts of an aqueous 10% zinc sulfate solution was added to the dispersion with slow stirring

309885/1109

• added, and a solution of 0.1 g equivalent of an aromatic carboxylic acid mentioned below, dissolved in 200 g of an aqueous 2% caustic soda solution, was added with stirring to bring about the reaction. 50 parts of SBR-iLatex were added to the dispersion to prepare a coating solution, which was applied by means of a coating stick so that an amount of pesticide of 3 g / m 2 was:
was pulled and dried.

2?

amount of 3 g / m 2 on 50 g / m paper

Comparison attempt 2

A color developer sheet was used for comparison in obtained in the same manner as in Example 2 but without using the surfactant.

Example 3

A color developing sheet according to the invention was prepared in the same manner as in Example 1 using of 95 parts of an aqueous 10 $ tin sulfate solution instead of an aqueous zinc chloride solution as in Example 1 obtained.

Comparative experiment 3

A career development sheet was provided for comparison in the in the same way as in Example 3, but without using the surface-active agent.

Example 4

A color developer sheet according to the invention was disclosed in in the same manner as in Example 2 using 57 parts of an aqueous 10% aluminum sulfate solution instead of an aqueous zinc sulfate solution as in example 2 received.

309885/110 3

Comparative experiment 4

A color developing sheet was prepared for comparison in the same manner as in Example 4 but without use of the surfactant. "

Example 5

60 parts of kaolin, 5 parts of a p-phenylphenol-formaldehyde condensate (which passed through a 44 / U screen (325 mesh) - a mixture of condensates with a degree of condensation from 2 to 10) and 2 parts of a surfactant mentioned below were dissolved in 300 parts of water or dispersed and the pH with an aqueous 10 $ -ige Caustic soda solution set to 11. 70 parts of an aqueous 10 $ zinc chloride solution were added to the dispersion added with gentle stirring and a solution of 0.1 g equivalent of an aromatic mentioned below Carboxylic acid, dissolved in 200 parts of an aqueous 2 50% caustic soda solution, was added with stirring to Induction of the reaction added. 50 parts of SBR latex were added to the dispersion to prepare a coating solution by means of a coating stick was applied so that a solids amount of 3 g / m on 50 g / m paper and dried.

Comparative experiment 5

A color developing sheet was obtained for comparison in the same manner as in Example 5 except that the surfactant was not used.

309885/1109

Comparison test results:

The crystal violet lactone or 3-benzylamino-7- microcapsules containing diethylaminofluoran!) οgen in contact on each color developer coated sheet according to Examples 1 to 5 and the comparative tests 1 to 5 are applied and the color is developed by a pressure load of 600 kg / cm.

After standing in the dark overnight, the reflection spectrum was in the wavelength range of 380 m / rev to 700 m / rev through a Beckmann spectrophotometer (DB type) is determined, and the light absorption at the maximum absorption is called the color density in Table I reproduced. The viscosity of each coating solution in Examples 1 to 5 and the comparative searches 1 through 5 have been determined and are presented in Table I. The determination was made with a viscometer from BI-Tyρ (60 rpm).

309885/1109

Table I.

co CD tD OO OO Cn

CC;

Fr. Example or
Comparative ■
attempt aromatic
Carboxylic acid surface active
middle Viscose it'it
the over-
train solution
(cP) Color density
of, crime
stallvio- -
lettlacton
(610 m / u) J color density
by 3-ben-
zylamino
7-diethyl
ainino-
fluoran
(600 m / u) 1 example 1 3.5 M tert.
buty! salicylic
acid Na triuina Iky Ib en ζ ol-
sulfonate 5.5 1.10 0.78 2 It Il Sodium salt one
higher alcohol
Sulphuric acid esters 7.0 0.98 0.78 3 Il Il Na tr i unaIkyIs ulfona t 7.5 1.05 0.79 4th ti ti Na tr i unma ph tha1en-
sulfonate foraldehyde
condensate 9.8 1.13 0.80 5 it It Na tri and iaIkylphos-
phat 15.3 0.98 0.76 6th dd 11 Poly oxy ethylene natriui
a Iky Is u If ona-t Q-
20.5 0.97 0.77 7th If dd Na triuradialkyIs sulfo-
succinate 16.5 0.99 0.78 8th H t! sulphated castor
ö la icy lpheno 1-ethylene
oxide adduct 15.0 0.97 0.75 9 dd It Alkylphenbl-ethylene-
oxide adduct 30.5 0.96 0.76 10 Matching
attempt 1 45.0 0.95 0.73

VD I

Ca)

CJl '

Table I (port settings)

CD CD CO OO

Cn

35

No. Example or
Comparative
attempt aronn tables
Carboxylic acid surface active
middle viscosity
the over
train solution
(cP) Color density
of crime
stallvio-
lettlacton
(610 m / u) Color density
by 3-ben-
zylamino
7-diethyl
amino
fluoran
(600 m / u) 11
12th
13th
H
• 5
16
17th
18th
19th
I. example 1
Comparison
attempt 1
Example 2
Comparison
attempt 2
Example 2
Comparison
attempt 2
Example 2
Comparison
attempt 2
Example 3 5-tert.
ButyIsa Ii-
cy! acid
3.5 DI
tert-amyl
salicylic
acid
Salicylic
acid
Hydroxy-1-
naphthoeic
acid
2-hydro;: y-
1-naphthoe-
acid
3.6 ~ Di-
tert-butyl
stilic, y? acid Sodium alkylbenzene
sulfonate 5.0 y
40.3
10.5
53.0
3.4
25.0
28.5
5.10
21.3
. 1.13
0.98
0.96
0.92
1.08
0.93
0.99
0.97
1.02 0.82
0.76
0.76
0.73
0.78
0.74
0.79
0.76
0.79 Sodium salt ζ of a Hö
higher alcohol-sulfur
acid esters Sodium naphthalenesul-
fonate formaldehyde
condensate Sodium dialkyl phosphate
Sodium dialkyl phosphate
Polyoxyethylene sodium
alkyl sulfonate

ro O

ro co

OJ

Table I (continued)

co CD CO CD CO cn

ETr. Example or
Comparative
attempt aromatic
Carboxylic acid surface active
middle viscosity
the over
train solution
TcP) Color density
of crime
stallvio-
lettlacton
(610 m / u) Color density
by 3-ben-
zylamino
7-diethyl
amino
fluoran
(600 ffl / u) 20th
21
22nd
23
24
25th
26th Comparison
attempt 3
Example 4
Comparison
attempt 4
Example 5
ti
H
Comparison
attempt 5 5-cyclohexyl-
salicylic acid
H 47.5
5.0
46.5
8.5
20.3
12.0
55.0 0.97
0.82
0.75
0.98
0.95
0.95
0.93 . 0.76
0.63
0.58
0.73
0.70
0.73
0.69 T sodium alkylbenzene
sulfonate Sodium alkylbenzene
sulfonate
sulphated castor
oil alkylphenol-ethylene
cxid adduct
Sodium salt of altitude
ren alcohol-sulfur
acidic esters

ro

⁰⁰

cn

The following surfactants were used in Examples 1-5.

SO ₅ company

NaO ₅ S-CHCOOC ₈ H ₁₇
CHCOOC ₈ H _{1 7}

(OC ₂ H ₄ ) ₁₆ 0S O ₅ Na

From the above match test results it can be seen that the presence of a surfactant in the coating layer of a metal compound of a aromatic carboxylic acid containing color developer sheet the color developing ability is improved and a coating

309885/1103

solution with significantly improved coating ability provides, i.e., according to the invention, the ear developability the color developer sheet further improved with great manufacturing advantages, the technical value of the recording sheet is increased and reduced production costs are achieved.

The invention has been made more preferred on the basis of the above Embodiments described without being limited to be.

3 0.9 88 5/1 1 Q a

Claims (6)

Claims 1. Recording sheet, characterized by a Layer of a color developer that, on contact with a color coupler forms a color image, the layer at least one metal compound of an aromatic carboxylic acid and contains a surfactant. 2. Recording sheet according to claim 1 _S, characterized in that the metal in the metal pre-bond of the carboxylic acid is a member of group IB, group HA, group II B, group III B, group IT A, group VI A, group YII B or group YIII des periodic system is t. 3. Recording sheet according to claim 1 or 2, characterized characterized in that the aromatic carboxylic acid has the following formulas: COOH COOH (R) _n or wherein R can be the same or different and is a hydrogen atom, a hydroxyl group, a halogen atom, a Nitro group, an alkyl group with 1 to 10 carbon atoms, v / obei the total number of carbons in the R radicals is less than 13, an ary! group, an arylamino group or an alicyclic group, m is an integer from 0 to 7 and η is an integer from 0 to 5 represent or that the aromatic carboxylic acid be dimerized via the substituent R as a methylene group can. BAD OftfQtNftL 309885/110 9 4. Recording sheet according to Claims 1 to 3, characterized characterized in that the surfactant is used in an amount of more than 0.5 part by weight per 100 parts by weight the metal compound of an aromatic carboxylic acid is contained. 5. Recording sheet according to claim 1 to 4, da ™ characterized in that the surfactant is an anionic surfactant, cationic surfactant or nonionic surfactant. 6. Recording sheet according to claim 1, characterized in that that the surfactant is an anionic surfactant. 309885/1109